o 19% D 8:50 PM oo cricket moodle-2016-2017.calstatela.edu 2 of 10 1. Field and

Question

o 19% D 8:50 PM oo cricket moodle-2016-2017.calstatela.edu 2 of 10 1. Field and force with three charges: At a particular moment, three small charged balls, negative and two are located as shown in Figure. "Inc, 7 nC, and -7 nc. (al) What is the electric field at the location of due to Q.? (a2) Repeat (al.but first calculate the clectric potential at the location of 0.due to Q: and then use that to calculate the electric field at the location of Qu due to a2) What is the electric field at the location of due to

Explanation / Answer

a1] E = kq2/r^2

= 9e9*7e-9/0.04^2

= 39375 N/C

a2] Potential at q1 due tto q2 = kq2/r

= 9e9*7e-9/0.04

= 1575 V

E = V/r = 1575/0.04 =39375 N/C

a2] E due to q3 = kq3/r^2

= 9e9*-7e-9/0.05^2

= -25200 N/C

a3] Ex = -25200*3/5 = -15120 N/C

Ey = 39375 -25200*4/5 = 19215 N/C

E = sqrt(19215 ^2+15120 ^2)

= 24450  N/C

b] F = qE =  24450*1e-9

= 2.445*10^-5 N answer

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